Why is it crucial to know the level of measurement (nominal, ordinal, metric) when conducting significance...

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Why is it crucial to know the level of measurement (nominal,ordinal, metric) when conducting significance testing? What flaw isevident with SPSS in this regard?

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1 Nominal scales are used for labeling variables without any quantitative value A variable can be treated as nominal when its values represent categories with no intrinsic ranking for example Gender One cannot rank Gender as malefemale is superior 2 Ordinal variables are same as Nominal but the measurements have a significant defining order Example Grades obtained by students in a test In general A is superior    See Answer
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